package com.sharemarking.platform.service.impl;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.Random;

import org.springframework.stereotype.Service;

import com.sharemarking.platform.service.ValidateCodeService;

@Service
public class ValidateCodeServiceImpl implements ValidateCodeService {
	// 验证码字符集  
    private final char[] chars = {   
        '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',   
        'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',  
        'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',  
        'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',   
        'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'};  
    // 字符数量  
    private final int SIZE = 4;  
    // 干扰线数量  
    private final int LINES = 5;  
    // 宽度  
    private final int WIDTH = 70;  
    // 高度  
    private final int HEIGHT = 30;  
    // 字体大小  
    private final int FONT_SIZE = 30;  
  
    /** 
     * 生成随机验证码及图片 
     * Object[0]：验证码字符串； 
     * Object[1]：验证码图片。 
     */  
    @Override
    public Object[] createImage() {  
        StringBuffer sb = new StringBuffer();  
        // 1.创建空白图片  
        BufferedImage image = new BufferedImage(  
            WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);  
        // 2.获取图片画笔  
        Graphics graphic = image.getGraphics();  
        // 3.设置画笔颜色
        graphic.setColor(new Color(230, 230, 230));  
        // 4.绘制矩形背景  
        graphic.fillRect(0, 0, WIDTH, HEIGHT);  
        // 5.画随机字符  
        Random ran = new Random();  
        for (int i = 0; i <SIZE; i++) {  
            // 取随机字符索引  
            int n = ran.nextInt(chars.length);  
            // 设置随机颜色  
            graphic.setColor(getRandomColor());  
            // 设置字体大小  
            graphic.setFont(new Font(  
                null, Font.BOLD + Font.ITALIC, FONT_SIZE));  
            // 画字符  
            graphic.drawString(  
                chars[n] + "", i * WIDTH / SIZE, HEIGHT*2/3);  
            // 记录字符  
            sb.append(chars[n]);  
        }  
        // 6.画干扰线  
        for (int i = 0; i < LINES; i++) {  
            // 设置随机颜色  
            graphic.setColor(getRandomColor());  
            // 随机画线  
            graphic.drawLine(ran.nextInt(WIDTH), ran.nextInt(HEIGHT),  
                    ran.nextInt(WIDTH), ran.nextInt(HEIGHT));  
        }  
        // 7.返回验证码和图片  
        return new Object[]{sb.toString(), image};  
    }  
  
    /** 
     * 随机取色 
     */  
    private Color getRandomColor() {  
        Random ran = new Random();  
        Color color = new Color(ran.nextInt(256),   
                ran.nextInt(256), ran.nextInt(256));
        return color;  
    }
}
